Title: Grassy Key Pet-friendly Vacations 2026 | Expedia.com ![](https://images.trvl-media.com/place/2437/83757040-1d80-4589-aea2-a5fe1bb3ba0c.jpg?impolicy=fcrop&w=1200&h=300&q=medium) # Grassy Key Pet-friendly Vacations ## Book a Pet-friendly Hotel + Flight or Car together to unlock savings Photo by Monica Ferro - ## Plan, book, travel with confidence - ### Better together Save up to $1,045 when you book a flight and hotel together\* - ### Find the right fit With over 300,000 hotels worldwide, it's easy to create a perfect package - ### Rest easy Plan, book, and manage your trip all in one place ## Top Pet-friendly Grassy Key Hotels ![Rainbow Bend Resort](https://images.trvl-media.com/lodging/4000000/3870000/3864000/3863945/60a631db_y.jpg?impolicy=resizecrop&rw=340&ch=150) ### Rainbow Bend Resort 57784 Overseas Hwy Marathon FL - 22 min walk from Dolphin Research Center Make it a pet-friendly trip and bring along your four-legged friend. Dogs are welcome (fees apply) at this oceanfront hotel. 8.2/10 Very Good! (860 reviews) Room was spotless. Comfortable bed. Welcoming staff. Reviewed on Feb 18, 2026 [](https://expedia.com/Marathon-Hotels-Rainbow-Bend-Resort.h3863945.Hotel-Information) ![Grassy Flats Resort & Beach Club](https://images.trvl-media.com/lodging/37000000/36890000/36881900/36881801/e7fc7008_y.jpg?impolicy=resizecrop&rw=340&ch=150) ### Grassy Flats Resort & Beach Club 58182 Overseas Hwy Marathon FL - 14 min walk from Dolphin Research Center This pet-friendly, oceanfront hotel welcomes dogs for an additional fee. Nearby Sunset Park Beach is a good place to stretch your legs if you need a walk. 9.4/10 Exceptional! (401 reviews) Staff was great. The room was clean but there were sugar ants in our room by the refrigerator. The CASE to Plate was excellent. We may return next year. The coffee machine in the room was to complicated to operate. A Keurig would be easier to operate for old people. Reviewed on Feb 18, 2026 [](https://expedia.com/Marathon-Hotels-Grassy-Flats-Resort-Beach-Club.h36881801.Hotel-Information) ![Gulf View Waterfront Resort](https://images.trvl-media.com/lodging/14000000/13280000/13278600/13278553/46de1e0c_y.jpg?impolicy=resizecrop&rw=340&ch=150) ### Gulf View Waterfront Resort 58743 OVERSEAS HWY Marathon FL - 4 min walk from Dolphin Research Center Dogs and cats will approve of the pet-friendly amenities, such as a dog park, during their stay at this hotel (fees apply for pets). 8.6/10 Excellent! (551 reviews) The bathroom was extremely small including a shower that was minute. The electricity in the bathroom flickered on and off. Amenities were barely existent. It took 4 days for the “heated” pool to warm up to be useable. No maid service ALL week. We had to go to the laundry room to get fresh towels. ... Reviewed on Feb 15, 2026 [](https://expedia.com/Marathon-Hotels-Gulf-View-Waterfront-Resort.h13278553.Hotel-Information) [See all 2,303 properties in Grassy Key](https://expedia.com/Hotel-Search?rfrrid=TG.LP.Hotels.Package®ionId=3000451823) Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. 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